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Loans - Recorded Investment of Individual Loan Categories (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | $ 3,665,343 |  | $ 3,012,553 |  |  |
Net loans | 3,647,387 |  | 2,994,733 |  |  |
Interest Due | 12,482 |  | 9,445 |  |  |
Deferred Fees / (Costs) | 1,282 |  | 779 |  |  |
Recorded Investment | 3,679,107 |  | 3,022,777 |  |  |
Recorded Investment | 3,661,151 |  | 3,004,957 |  |  |
Allowance for loan losses | (17,956) | $ (18,305) | (17,820) | $ (17,798) | $ (17,071) | $ (16,394)
Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 2,048,035 |  | 1,723,535 |  |  |
Interest Due | 7,528 |  | 5,596 |  |  |
Deferred Fees / (Costs) | (1,870) |  | (1,945) |  |  |
Recorded Investment | 2,053,693 |  | 1,727,186 |  |  |
Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 952,116 |  | 742,244 |  |  |
Interest Due | 2,621 |  | 2,035 |  |  |
Deferred Fees / (Costs) | 12 |  | 17 |  |  |
Recorded Investment | 954,749 |  | 744,296 |  |  |
Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 665,192 |  | 546,774 |  |  |
Interest Due | 2,333 |  | 1,814 |  |  |
Deferred Fees / (Costs) | 3,140 |  | 2,707 |  |  |
Recorded Investment | 670,665 |  | 551,295 |  |  |
Owner Occupied Real Estate [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 723,218 |  | 563,929 |  |  |
Interest Due | 1,735 |  | 1,273 |  |  |
Deferred Fees / (Costs) | (1,351) |  | (1,368) |  |  |
Recorded Investment | 723,602 |  | 563,834 |  |  |
Non Owner Occupied Real Estate [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 766,574 |  | 714,136 |  |  |
Interest Due | 1,336 |  | 1,069 |  |  |
Deferred Fees / (Costs) | (390) |  | (477) |  |  |
Recorded Investment | 767,520 |  | 714,728 |  |  |
Residential Spec Homes [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 10,813 |  | 5,195 |  |  |
Interest Due | 20 |  | 13 |  |  |
Deferred Fees / (Costs) | (33) |  |  |  |  |
Recorded Investment | 10,800 |  | 5,208 |  |  |
Development & Spec Land [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 37,115 |  | 46,523 |  |  |
Interest Due | 104 |  | 131 |  |  |
Deferred Fees / (Costs) | (15) |  | (15) |  |  |
Recorded Investment | 37,204 |  | 46,639 |  |  |
Commercial and Industrial [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 510,315 |  | 393,752 |  |  |
Interest Due | 4,333 |  | 3,110 |  |  |
Deferred Fees / (Costs) | (81) |  | (85) |  |  |
Recorded Investment | 514,567 |  | 396,777 |  |  |
Residential Mortgage [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 773,444 |  | 644,094 |  |  |
Interest Due | 2,377 |  | 1,861 |  |  |
Deferred Fees / (Costs) | 12 |  | 17 |  |  |
Recorded Investment | 775,833 |  | 645,972 |  |  |
Residential Construction [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 23,041 |  | 24,030 |  |  |
Interest Due | 50 |  | 42 |  |  |
Recorded Investment | 23,091 |  | 24,072 |  |  |
Mortgage Warehousing [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 155,631 |  | 74,120 |  |  |
Interest Due | 194 |  | 132 |  |  |
Recorded Investment | 155,825 |  | 74,252 |  |  |
Direct Installment [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 42,048 |  | 34,233 |  |  |
Interest Due | 137 |  | 103 |  |  |
Deferred Fees / (Costs) | 678 |  | 593 |  |  |
Recorded Investment | 42,863 |  | 34,929 |  |  |
Indirect Installment [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 344,567 |  | 314,177 |  |  |
Interest Due | 789 |  | 738 |  |  |
Recorded Investment | 345,356 |  | 314,915 |  |  |
Home Equity Loan [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 278,577 |  | 198,364 |  |  |
Interest Due | 1,407 |  | 973 |  |  |
Deferred Fees / (Costs) | 2,462 |  | 2,114 |  |  |
Recorded Investment | $ 282,446 |  | $ 201,451 |  |  |

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